磁性Ag@Fe_3O_4@C负载纳米金的制备及其SERS性能
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摘要
利用一步溶剂热法制备了具有核壳结构的Ag@Fe_3O_4磁性纳米颗粒,然后以葡萄糖作为碳源对Ag@Fe_3O_4进行包覆,再利用酰胺化反应成功的将聚乙烯亚胺(PEI)修饰到Ag@Fe_3O_4@C表面,最后以N-Au共价键的方式将Au纳米粒子组装到Ag@Fe_3O_4@C表面。以4-巯基苯甲酸(4MBA)为拉曼活性探针分子来考察该复合纳米材料的表面增强拉曼(SERS)性能。通过控制Au纳米粒子的加入量,来调节Ag@Fe_3O_4@C-Au复合纳米材料的SERS活性。通过实验测试及利用时域有限差分法(FDTD)得出不同纳米金用量包覆的Ag@Fe_3O_4@C磁性纳米颗粒对4MBA的SERS效果依次为Ag@Fe_3O_4@C-Au-40>Ag@Fe_3O_4@C-Au-10>Ag@Fe_3O_4@C-Au-60>Ag@Fe_3O_4@C,其中Ag@Fe_3O_4@C-Au-40的饱和磁化强度为411 A·g-1,其对4MBA的检测限为1×10-9 mol·L-1。这种功能性复合材料既具有良好的SERS活性,又可通过外加磁场的方式实现对待测分子的分离、富集。
An Ag@Fe_3O_4@C-Au microspheres has been developed which including the synthesis of Ag@Fe_3O_4 by one-step via a versatile solvothermal reaction, an interlayer of carbon shell coating around the Ag@Fe_3O_4 with glucose as carbon source, the surfuce of Ag@Fe_3O_4@C modified by PEI via amidation reaction, and the coating Au nanoparticles on the surface of Ag@Fe_3O_4@C. The enhancement effect in the Raman active was investigated by using 4-mercaptobenzoic acid(4 MBA) molecules as a probe molecule. In addition, we have regulated the SERS behavior of Ag@Fe_3O_4@C-Au core-shell microspheres by adjusting the additional amount of Au nanoparticles(NPs). The magnetic hysteresis loops showed the saturation magnetization(Ms) values of Ag@Fe_3O_4@C-Au-40 are about 411 A·g-1, and the SERS effect of 4 MBA on different microspheres is Ag@Fe_3O_4@C-Au-40 > Ag@Fe_3O_4@CAu-10 > Ag@Fe_3O_4@C-Au-60 > Ag@Fe_3O_4@C nanospheres, which was identified by Finite Difference Time Domain(FDTD). Furthermore, the low concentrations of 4 MBA(1×10-9 mol·L-1) in the solution can be detected by the Ag@Fe_3O_4@C-Au-40 microspheres. In addition, the Ag@Fe_3O_4@C-Au microspheres can be recycled with magnet.
An Ag@Fe_3O_4@C-Au microspheres has been developed which including the synthesis of Ag@Fe_3O_4 by one-step via a versatile solvothermal reaction, an interlayer of carbon shell coating around the Ag@Fe_3O_4 with glucose as carbon source, the surfuce of Ag@Fe_3O_4@C modified by PEI via amidation reaction, and the coating Au nanoparticles on the surface of Ag@Fe_3O_4@C. The enhancement effect in the Raman active was investigated by using 4-mercaptobenzoic acid(4 MBA) molecules as a probe molecule. In addition, we have regulated the SERS behavior of Ag@Fe_3O_4@C-Au core-shell microspheres by adjusting the additional amount of Au nanoparticles(NPs). The magnetic hysteresis loops showed the saturation magnetization(Ms) values of Ag@Fe_3O_4@C-Au-40 are about 411 A·g-1, and the SERS effect of 4 MBA on different microspheres is Ag@Fe_3O_4@C-Au-40 > Ag@Fe_3O_4@CAu-10 > Ag@Fe_3O_4@C-Au-60 > Ag@Fe_3O_4@C nanospheres, which was identified by Finite Difference Time Domain(FDTD). Furthermore, the low concentrations of 4 MBA(1×10-9 mol·L-1) in the solution can be detected by the Ag@Fe_3O_4@C-Au-40 microspheres. In addition, the Ag@Fe_3O_4@C-Au microspheres can be recycled with magnet.
引文
[1]ZHUANG Yan(庄严),ZHOU Qun(周群),ZHOU Qun-Fa(周全法).Precious Met.(贵金属),2011,32(2):5-8
[2]Zhou X,Xu W,Wang Y,et al.J.Phys.Chem.A,2015,114(46):19607-19613
[3]Mahmoud K A,Zourob M.Analyst,2013,138(9):2712-2719
[4]Tang X,Dong R,Yang L,et al.J.Raman Spectrosc.,2015,46(5):470-475
[5]Du J,Jing C.J.Colloid Interface Sci.,2011,358(1):54-59
[6]Du J,Cui J,Jing C.Chem.Commun.,2014,50(3):347-349
[7]Ye Y,Chen J,Ding Q,et al.Nanoscale,2013,5(13):5887-5895
[8]Gan Z,Zhao A,Zhang M,et al.Dalton Trans.,2013,42(24):8597-8605
[9]Sun Z,Du J,Yan L,et al.ACS Appl.Mater.Interfaces,2016,8(5):3056-3062
[10]Sun L,He J,An S,et al.J.Mol.Struct.,2013,1046(12):74-81
[11]Shen J H,Zhu Y,Yang X,et al.Langmuir,2013,29(2):690-695
[12]LI Zheng-Xing(李振兴),ZHAO Ai-Wu(赵爱武),GAO Qian(高倩),et al.Acta Chim.Sinica(化学学报),2015,73(8):847-850
[13]Liu SH,Lu F,Liu Y,et al.J.Nanopart.Res.,2012,15(1):1331-1339
[14]YAO Zhu-Fu(姚祖福),HUANG Ke-Long(黄可龙),YU JinGang(于金刚),et al.Chinese J.Inorg.Chem.(无机化学学报),2009,25(12):2163-2168
[15]Hummel R E,Wissmanni P.Handbook of Optical Properties:Optics of Small Particles,Interfaces and Surfaces,Vol.Ⅱ.Florida:CRC Press,1996.
[16]Su J,Zhang Y,Xu S,et al.Nanoscale,2014,6(10):5181-5192
[2]Zhou X,Xu W,Wang Y,et al.J.Phys.Chem.A,2015,114(46):19607-19613
[3]Mahmoud K A,Zourob M.Analyst,2013,138(9):2712-2719
[4]Tang X,Dong R,Yang L,et al.J.Raman Spectrosc.,2015,46(5):470-475
[5]Du J,Jing C.J.Colloid Interface Sci.,2011,358(1):54-59
[6]Du J,Cui J,Jing C.Chem.Commun.,2014,50(3):347-349
[7]Ye Y,Chen J,Ding Q,et al.Nanoscale,2013,5(13):5887-5895
[8]Gan Z,Zhao A,Zhang M,et al.Dalton Trans.,2013,42(24):8597-8605
[9]Sun Z,Du J,Yan L,et al.ACS Appl.Mater.Interfaces,2016,8(5):3056-3062
[10]Sun L,He J,An S,et al.J.Mol.Struct.,2013,1046(12):74-81
[11]Shen J H,Zhu Y,Yang X,et al.Langmuir,2013,29(2):690-695
[12]LI Zheng-Xing(李振兴),ZHAO Ai-Wu(赵爱武),GAO Qian(高倩),et al.Acta Chim.Sinica(化学学报),2015,73(8):847-850
[13]Liu SH,Lu F,Liu Y,et al.J.Nanopart.Res.,2012,15(1):1331-1339
[14]YAO Zhu-Fu(姚祖福),HUANG Ke-Long(黄可龙),YU JinGang(于金刚),et al.Chinese J.Inorg.Chem.(无机化学学报),2009,25(12):2163-2168
[15]Hummel R E,Wissmanni P.Handbook of Optical Properties:Optics of Small Particles,Interfaces and Surfaces,Vol.Ⅱ.Florida:CRC Press,1996.
[16]Su J,Zhang Y,Xu S,et al.Nanoscale,2014,6(10):5181-5192